简介：Thepurposeofthisstudyistoinvestigatedifferentfactorsoftheartifactinsurfaceelectromyography(EMG)signalcausedbyfunctionalelectricalstimulation(FES).Thefactorsinvestigatedincludethesizeofstimulationelectrodepads,theamplitude,frequency,andpulsewidthofthestimulationwaveformandthedetectingelectrodepoints.Wecalculatetherootmeansquare(RMS)ofEMGsignaltoanalyzetheeffectofthesefactorsontheM-waveproperties.TheresultsindicatethattheM-wavemainlydependsonthestimulationamplitudeandthedistributionofdetectingelectrodes,butnotontheotherfactors.Thisstudycanassistthereductionofartifactandtheselectionofdetectingelectrodepoints.

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简介：Inhighlypopulatedurbancenters,traditionalseismicsurveysourcescannolongerbeproperlyappliedduetorestrictionsinmoderncivilianlifestyles.Theambientvibrationnoise,includingbothmicroseismsandmicrotremor,thougharegenerallyweakbutavailableanywhereandanytime,canbeanidealsupplementarysourceforconductingseismicsurveysforengineeringseismologyandearthquakeengineering.Thisisfundamentallysupportedbyadvanceddigitalsignalprocessingtechniquesforeffectivelyextractingtheusefulinformationoutfromthenoise.Thus,itcanbeessentiallyregardedasapassiveseismicmethod.Inthispaperwefirstmakeabriefsurveyoftheambientvibrationnoise,followedbyaquicksummaryofdigitalsignalprocessingforpassiveseismicsurveys.ThentheapplicationsofambientnoiseinengineeringseismologyandearthquakeengineeringforurbansettingsareillustratedwithexamplesfromBeijingmetropolitanarea.Forengineeringseismologytheexampleistheassessmentofsiteeffectinalargeareaviamicrotremorobservations.Forearthquakeengineeringtheexampleisforstructuralcharacterizationofatypicalreinforcedconcretehigh-risebuildingusingbackgroundvibrationnoise.Byshowingtheseexampleswearguethattheambientnoisecanbetreatedasanewsourcethatiseconomical,practical,andparticularlyvaluabletoengineeringseismologyandearthquakeengineeringprojectsforseismichazardmitigationinurbanareas.

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简介：Itiscurrentlydifficultfortheamputeetoperceiveenvironmentalinformationsuchastactilepressureonthefingertipofthepresentupperlimbprostheses.Sensoryfeedbackinducedbycutaneouselectricalstimulationcanbeusedtotransmittactileinformationfromhandprosthesestosensorynerveofintactupperarm,thusproducingthecorrespondingperceptionsinhumanbrain.Inordertohaveadeeperunderstandingonthedistributionofstimulationcurrentwithinthelimb,andfindabetterplacementofthestimulatingandreferenceelectrodes,weconstructedathree-dimensionalupper-limbmodeltosystematicallystudytheeffectofelectrodeplacementoncurrentdistributionbasedonfiniteelementanalysis.Inthesesimulations,thereferenceelectrodeispositionedatfourdifferentlocationsaroundandontheaxialdirectionofthearm.Theresultsshowthatwiththeincreaseofdistancebetweenreferenceelectrodeandstimulatingelectrode,thecurrentdensityincreasesintheskinlayeroftheupperlimb.Whenthereferenceelectrodeisontheoppositesideofstimulatingelectrodearoundthearm,thecurrentismoreconcentratedintheskinlayer,whichisinlinewithrecentfindingsinpsychophysiologicalexperiments.Butbetterspatialselectivitycouldbeachievedwhenthereferenceelectrodeisclosertothestimulatingelectrodearoundthearm,anditismoreobviousincomparisonwiththatontheaxialdirection.Thesefindingswillprovideinsightsforthedesignofelectrodearrayusedforevokingcutaneoussensoryafferents.

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简介：在这个工作，n类型非结晶的硅氧化物薄电影被RF-PECVD方法用SiH的煤气的混合物扔4,公司2,H2,和PH3。硅氧化物的免职率，折射索引，乐队差距，水晶的体积部分，和传导性变瘦电影坚定、分析。有1.99的折射索引的电影，2.6eV的乐队差距和10的电导率<啜class=“a-plus-plus”>7S/cm被获得，它对中间的反射镜层合适。

简介：Constrainedgroovepressing(CGP)isanewsevereplasticdeformationmethodsuitableforproducingultra-finegrainedsheetmetals.Inthiswork,theprocessingefficiencyforamuti-passCGPofpurecopperwasinvestigated.Witharelativelysmallgroovewidthof2mmandtightconstraint,asharpvariationofmechanicalpropertieswithpassnumberisobserved.Subgrainswiththesizeof*0.5lmhavedistinctboundaries,whichisthepredominantfeatureinthemicrostructureafterthreepasses.Theevolutionofdeformationhomogeneitycharacterizedbymicro-hardnessdistributionwasexaminedindetail.Observationsofopticalmicrographsandfracturesurfacemorphologyconfirmtheevolutionrule.Therelationbetweenelectricalresistivityandaccumulativeplasticstrainwasdiscussed.Crystallinedefects,micro-cracks,andmicrostructureuniformitytogetherdeterminethechangeofelectricalresistivityofCGPcopper.

简介：一般来说，量钥匙分发(QKD)由于量无常原则，量noncloning定理和意味着量不能进一步被划分的量nondividing原则为完美的设备被证明无条件地安全。然而，在系统使用的实际光、电的设备是有瑕疵的，它能被偷听者部分利用到或完全侦察在合法聚会之间的秘密钥匙。在这篇文章，我们简短首先在量关于国际性地执行的有瑕疵的设备砍在一些试验性的QKD系统上上考察最近的工作，然后，我们将在细节介绍我们的最近的砍工作包括被动法拉第镜子攻击，部分随机的阶段攻击，选择波长的photon-number-splitting攻击，频率移动攻击，和single-photon-detector攻击。那些量攻击提醒人改进安全由简单地增加反措施或采用象测量设备独立人士协议那样的一个完全不同的协议避免量砍在测量设备的瑕疵上由于有瑕疵的设备在实际QKD系统存在[Lo，等，Phys。加快。Lett，2012，108：130503]。

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简介：Earthquakeengineeringresearchanddevelopmenthavereceivedmuchattentionsincethefirsthalfofthetwentiethcentury.Thisvaluableresearchpresentedahugestepforwardinunderstandingearthquakehazardmitigation,whichresultedinappreciablereductionoftheeffectsofpastearthquakes.Nevertheless,the2011Tohokuearthquakeandthesubsequenttsunamiresultedinmajordamage.Thispaperpresentsthetimelineofearthquakemitigationandrecovery,asseenbytheauthors.Possibleresearchdirectionswheretheauthorsthinkthatmanyopenquestionsstillremainareidentified.Theseareprimarilybasedontheimportantlessonslearnedfromthe2011Tohokuearthquake.

简介：Siteengineeringseismicsurveyprovidesbasicdataforseismiceffectanalysis.Asanimportantparameterofsoil,shear-wavevelocityisusuallyobtainedthroughwavevelocitytestinginborehole.Inthispaper,thepassivesourcesurface-wavemethodisintroducedintothesiteengineeringseismicsurveyandpracticallyappliedinanengineeringsiteofShijingshanDistrict.Byrecordingtheubiquitousweakvibrationontheearthsurface,extractthedispersioncurvefromthesurface-wavecomponentsusingtheSPACmethodandobtaintheshear-wavevelocitystructurefrominversion.Overthedepthof42munderground,ittotallyconsistsoffivelayerswithinterfacedepthof3.31,4.50,7.23,17.41,and42.00m;andshear-wavevelocityof144.0,198.3,339.4,744.2,and903.7m/s,respectively.Theinversionresultisusedtoevaluatesiteclassification,determinethemaximumshearmodulusofsoil,providebasisforfurtherseismichazardanalysisandsiteassessmentorsitezoning,etc.Theresultshowsthatthepassivesourcesurface-wavemethodisfeasibleinthesiteengineeringseismicsurveyandcanreplaceboreholes,shortensurveyperiod,andreduceengineeringcosttosomeextent.

简介：Thisresearchusesalginateandhyaluronicacidasthemaincomponenttopreparesupport,thenexploresthepossibilitiesasatissueengineeringscaffold.Firstly,prepareHAwithvariousaveragemolecularweightandalginatewithdifferentviscosity,mixthemupatacertainproportionandmakeitintoaAlgCa2+-HAcompositescaffoldwithafilm-formingmethod.Thisarticlediscussesthefeasibilityofthisscaffoldusedintissueengineeringfieldaccordingtotheconsequenceofmoisturecontenttesting,mechanicalanalysis,andscanningelectronmicroscopyanalysis.ThestructureandpropertiesofAlgCa2+-HAcompositescaffoldarecloselyrelatedtosomefactorssuchasaveragemolecularweightofhyaluronicacid,hyaluronicacidconcentration,alginateviscosity,cross-linkingagentsandprocessingtechnology.TheAlgCa2+-HAcompositematerial,whichisatdifferentproportionsandaddingdifferentcross-linkingagent,hassomecertaincharacteristics:moisturecontentrangingfrom50%to95%,tensilestrengthbetween2.69N/mm2and4.299N/mm2,andelongationatbreakisabout58%to160%.ThepreparedAlgCa2+-HAcompositescaffoldscanbeusedastissueengineeringscaffoldsresultingfromitshighmoisturecontent,goodmechanicalpropertiesandidealporestructure.更多还原

简介：Withthedevelopmentandimplementationofperformance-basedearthquakeengineering,harmonizationofperformancelevelsbetweenstructuralandnonstructuralcomponentsbecomesvital.Evenifthestructuralcomponentsofabuildingachieveacontinuousorimmediateoccupancyperformancelevelafteraseismicevent,failureofarchitectural,mechanicalorelectricalcomponentscanlowertheperformanceleveloftheentirebuildingsystem.Thisreductioninperformancecausedbythevulnerabilityofnonstructuralcomponentshasbeenobservedduringrecentearthquakesworldwide.Moreover,nonstructuraldamagehaslimitedthefunctionalityofcriticalfacilities,suchashospitals,followingmajorseismicevents.Theinvestmentinnonstructuralcomponentsandbuildingcontentsisfargreaterthanthatofstructuralcomponentsandframing.Therefore,itisnotsurprisingthatinmanypastearthquakes,lossesfromdamagetononstructuralcomponentshaveexceededlossesfromstructuraldamage.Furthermore,thefailureofnonstructuralcomponentscanbecomeasafetyhazardorcanhamperthesafemovementofoccupantsevacuatingbuildings,orofrescueworkersenteringbuildings.Incomparisontostructuralcomponentsandsystems,thereisrelativelylimitedinformationontheseismicdesignofnonstructuralcomponents.Basicresearchworkinthisareahasbeensparse,andtheavailablecodesandguidelinesareusually,forthemostpart,basedonpastexperiences,engineeringjudgmentandintuition,ratherthanonobjectiveexperimentalandanalyticalresults.Often,designengineersareforcedtostartalmostfromsquareoneaftereachearthquakeevent:toobservewhatwentwrongandtotrytopreventrepetitions.Thisisaconsequenceoftheempiricalnatureofcurrentseismicregulationsandguidelinesfornonstructuralcomponents.Thisreviewpapersummarizescurrentknowledgeontheseismicdesignandanalysisofnonstructuralbuildingcomponents,identifyingmajorknowledgegapsthatwillneedtobefilledbyfutureresearch.Furthe

简介：OMAE2014istheidealforumforresearchers,engineers,managers,techniciansandstudentsfromthescientificandindustrialcommunitiesfromaroundtheworldto：

简介：Poly(lactide-co-glycolide)-poly(ethylene乙二醇)-poly(lactide-co-glycolide)(PLGA-PEG-PLGA)triblock共聚物是作为macroinitiator和亚锡的octoate与木钉通过LA和GA的戒指洞聚合被综合催化剂。进在水的答案的微粒自我装配的amphiphilic共聚物，和形成的hydrogels作为在相对高的集中的温度的增加(>15wt%)。hydrogel的有利degradability被证实由在vitro并且在vivo降级实验。好细胞并且thermogel的tissular相容性被表明。骨头髓的优秀粘附和增长间充质的干细胞为软骨织物工程赋予了PLGA-PEG-PLGAthermogellinghydrogel以迷人的前景。

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